<template>
	<view>
		<view class="search-box">
		  <uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
		</view>
    
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item"v-for="(item,i) in searchResults" :key='i' @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clearHistory"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" @click="handleClick(item)" class="history-item" v-for="(item,i) in histories" :key='i'>
        </uni-tag>
      </view>
    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
        kw:'' ,// 关键词
        searchResults: [], // 搜索结果列表
        historyList:[] // 搜索历史的数组
			};
		},
    methods: {
      // input 输入事件的处理函数
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          // console.log(e.value)
          this.kw = e.value
          // 根据关键词，查询搜索建议列表
          this.getSearchList()
        }, 500)
      },
      // 根据搜索关键词，搜索商品建议列表
      async getSearchList(){
        // 判断关键词是否为空
        if(this.kw.length === 0) return this.searchResults = []
        // 发起请求，获取搜索建议列表
        const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query: this.kw})
        if(res.meta.status === !200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      
      gotoDetail(item){
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchHistory(){
        // 把搜索关键词 push 到 historyList 数组中
        // this.historyList.push(this.kw)
        // 解决搜索关键词重复的问题
        const set = new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList = Array.from(set)
        // 调用 uni.setStorageSync(key,value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      
      clearHistory(){
        this.historyList = []
        uni.setStorageSync('kw',[])
      },
      
      // 点击搜索记录搜索
      handleClick(value){
        this.kw = value
        this.getSearchList()
      }
    },
    computed: {
      histories(){
        return [...this.historyList].reverse()
      }
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    }
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;
  
  .sugg-item {
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;
    
    .goods-name {
      // 文字不允许换行
      white-space: nowrap;
      overflow: hidden;
      // 文本溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}


  .history-box {
    padding: 0 5px;
    
    .history-title {
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }
    
    .history-list {
      display: flex;
      flex-wrap: wrap;
      
      .uni-tag {
        margin: 5px 5px 0 0;
      }
    }
  }
</style>
